/* ========================================
   PROFESSIONAL PORTFOLIO - CSS Variables
   ======================================== */
:root {
  /* Professional Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-accent: #f0f4f8;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-tertiary: #718096;
  --accent-primary: #2563eb;
  --accent-secondary: #1e40af;
  --accent-light: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
  --card-bg: #ffffff;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Typography */
  --font-primary:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-secondary: "Cairo", sans-serif;

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}

/* Professional Dark Theme */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-accent: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-secondary: #2563eb;
  --accent-light: #60a5fa;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --border-color: #334155;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
  --card-bg: #1e293b;
}

/* ========================================
   Global Styles
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[dir="rtl"] body {
  font-family: var(--font-secondary);
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========================================
   Navigation Bar - Professional
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all var(--transition-normal);
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.95);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem var(--spacing-md);
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-text {
  color: var(--accent-primary);
  transition: color var(--transition-fast);
}

.brand-text:hover {
  color: var(--accent-secondary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.5rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-size: 0.9375rem;
}

.nav-links a:hover {
  color: var(--accent-primary);
  background-color: var(--bg-secondary);
}

.nav-links a.active {
  color: var(--accent-primary);
  background-color: var(--bg-secondary);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1rem;
  font-weight: 600;
}

.toggle-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.toggle-btn:active {
  transform: translateY(0);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 1.5rem;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ========================================
   Hero Section - Professional
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 5rem;
  position: relative;
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
}

[data-theme="dark"] .hero {
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, var(--bg-secondary) 100%);
  opacity: 0.5;
  pointer-events: none;
}

.hero-content {
  text-align: center;
  z-index: 1;
  position: relative;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.profile-image {
  width: 180px;
  height: 180px;
  margin: 0 auto var(--spacing-md);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 4px solid var(--accent-primary);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.profile-image:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.profile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
  letter-spacing: -1px;
}

.name {
  display: block;
  color: var(--text-primary);
}

.name-ar {
  display: block;
  font-size: 2.5rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-weight: 600;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
}

/* ========================================
   Buttons - Professional
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  font-size: 0.9375rem;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* ========================================
   Sections
   ======================================== */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
}

/* ========================================
   About Section
   ======================================== */
.about-section {
  background: var(--bg-secondary);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-text {
  text-align: center;
}

.about-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-actions {
  margin-top: var(--spacing-md);
}

/* ========================================
   Skills Section
   ======================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.skill-card {
  background: var(--card-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

.skill-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.skill-icon {
  font-size: 3rem;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
  transition: transform var(--transition-normal);
}

.skill-card:hover .skill-icon {
  transform: scale(1.1);
}

.skill-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.skill-level {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ========================================
   Experience Section - Timeline
   ======================================== */
.experience-section {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 0;
  height: 100%;
  width: 2px;
  background: var(--accent-gradient);
}

[dir="rtl"] .timeline::before {
  left: auto;
  right: 30px;
}

.timeline-item {
  position: relative;
  padding-left: 70px;
  padding-bottom: var(--spacing-lg);
}

[dir="rtl"] .timeline-item {
  padding-left: 0;
  padding-right: 70px;
}

.timeline-dot {
  position: absolute;
  left: 21px;
  top: 0;
  width: 20px;
  height: 20px;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 0 4px var(--accent-primary) 20;
}

[dir="rtl"] .timeline-dot {
  left: auto;
  right: 21px;
}

.timeline-content {
  background: var(--card-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

[dir="rtl"] .timeline-content:hover {
  transform: translateX(-5px);
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
}

.timeline-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   Education Section
   ======================================== */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  max-width: 900px;
  margin: 0 auto;
}

.education-card {
  background: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.education-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.education-icon {
  font-size: 3rem;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
}

.education-degree {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.education-institution {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.education-status,
.education-gpa {
  color: var(--text-tertiary);
  font-size: 0.9375rem;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
  background: var(--bg-secondary);
}

.contact-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact-intro {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.contact-item {
  background: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.contact-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.contact-icon {
  font-size: 2.5rem;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
}

.contact-details h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.contact-details a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
}

.contact-details a:hover {
  color: var(--accent-secondary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-tertiary);
  padding: var(--spacing-md) 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* ========================================
   Scroll Animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-normal);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
  }

  [dir="rtl"] .nav-menu {
    left: auto;
    right: -100%;
    transition: right var(--transition-normal);
  }

  .nav-menu.active {
    left: 0;
  }

  [dir="rtl"] .nav-menu.active {
    right: 0;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .name-ar {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }

  .timeline::before {
    left: 15px;
  }

  [dir="rtl"] .timeline::before {
    left: auto;
    right: 15px;
  }

  .timeline-item {
    padding-left: 50px;
  }

  [dir="rtl"] .timeline-item {
    padding-left: 0;
    padding-right: 50px;
  }

  .timeline-dot {
    left: 6px;
  }

  [dir="rtl"] .timeline-dot {
    left: auto;
    right: 6px;
  }

  .profile-image {
    width: 150px;
    height: 150px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero-title {
    font-size: 2rem;
  }

  .name-ar {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .profile-image {
    width: 130px;
    height: 130px;
  }

  .section {
    padding: var(--spacing-lg) 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
  }

  .education-grid,
  .contact-info {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
  text-align: center;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}